论文标题
各向异性宇宙中的互动黑暗扇区：观察约束和$ h_ {0} $张力
Interacting Dark Sectors in Anisotropic Universe: Observational Constraints and $H_{0}$ Tension
论文作者
论文摘要
本研究揭示了观察性的约束，这些构成了各向异性Bianchi I型宇宙的暗成分之间的耦合。我们假设暗物质与暗能量之间的相互作用，并将连续性方程式分解为包括相互作用项$γ$的连续性方程。当深色组件之间的耦合是恒定的，并且（ii）当它是红移（$ z $）的函数时，已经考虑了两种情况（i）。大都会狂热算法已用于通过使用从宇宙中时序（CC）技术，宇宙微波背景（CMB）BARYON声学振荡（BAO）的观察性哈勃数据进行分析来执行Monte Carlo Markov链（MCMC）分析。参数$ h_ {0} $。可以获得所有数据库的组合以及$ h_ {0} $在当前的深色能量密度上被边缘化的，对耦合的当前价值的严格约束为$ -0.001 <Δ<0.041 <0.041 $常数耦合模型和$ -0.042 <Δ<0.042 <Δ<0.053 $ in vare coupling coupl coupl couplel coupl couplel coupl coupl coupl coupling coupling coupling coupling coupling模型。通常，对于这两种模型，我们都发现$ω^{x} \大约-1 $和$δ（δ_{0}）\大约0 $，这表明最近的数据仍然有利于$λ$ CDM模型。我们的估计表明，在恒定耦合模型中，$（h_ {0} = 73.9^{+1.5} _ { - 0.95}，δ= 0.023^{+0.017} _ { - 0.024}）$自然地导致了胆量常数的一致值。该结果很有趣，因为先前的作品表明，这么高的哈勃常数值需要耦合参数$δ$的显着值。还观察到，在恒定耦合模型中，我们没有发现估计的$ H_ {0} $与Hubble Space望远镜（HST）报告的估计$ H_ {0} $之间的任何分歧。
The present study reveals observational constraints on the coupling between dark components of anisotropic Bianchi type I universe. We assume interaction between dark matter and dark energy and split the continuity equation with inclusion of interaction term $Γ$. Two scenarios have been considered (i) when coupling between dark components is constant and (ii) when it is a function of redshift ($z$). Metropolis-Hasting algorithm has been used to perform Monte Carlo Markov Chain (MCMC) analysis by using observational Hubble data obtained from cosmic chronometric (CC) technique, cosmic microwave background (CMB) baryon acoustic oscillation (BAO), Pantheon compilation of Supernovae type Ia (SNIa), their joint combination and a Gaussian prior on the Hubble parameter $H_{0}$. It is obtained that the combination of all databases plus $H_{0}$ prior marginalized over a present dark energy density gives stringent constraints on the current value of coupling as $-0.001<δ<0.041$ in constant coupling model and $-0.042<δ<0.053$ in varying coupling model at 68\% confident level. In general, for both models, we found $ω^{X}\approx -1$ and $δ(δ_{0})\approx 0$ which indicate that still recent data favor uncoupled $Λ$CDM model. Our estimations show that in constant coupling model $(H_{0}=73.9^{+1.5}_{-0.95}, δ=0.023^{+0.017}_{-0.024})$ which naturally leads to consistent value of the Hubble constant. This result is interesting because the previous works show that such a high value of Hubble constant requires the significant value of coupling parameter $δ$. It has been also observed that in the constant coupling model, we do not find any disagreement between the estimated $H_{0}$ and those reported by Hubble space telescope (HST) and large scale structure (LSS) experiments.
